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Finding the Fourth Proportional to 66.48, 100.17 and 64.32

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Solution

The fourth proportional to 66.48, 100.17 and 64.32 is: 96.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.48 : 100.17 = 64.32 : x
  2. Step 2: Convert to fraction form
    66.48/100.17 = 64.32/x
  3. Step 3: Cross multiply
    66.48x = 100.17 × 64.32
  4. Step 4: Simplify right side
    66.48x = 6,442.93
  5. Step 5: Solve for x
    x = 6,442.93/66.48
  6. Step 6: Final answer
    x = 96.92

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.